Meter

A meter is an electronic measuring instrument that combines several measurement functions in one unit. A typical meter would include basic features such as the ability to measure voltage, current, and resistance. Meters may use analog or digital circuits. Analog instruments are usually based on a micro ammeter whose pointer moves over a scale calibrated for all the different measurements that can be made. Digital instruments usually display digits, but may display a bar of a length proportional to the quantity being measured.